Verbundschlauch

The six families in this range

The range is grouped by what the liner has to survive, not by where the hose is sold. Each family page carries its own size table and test data.

• Chemical composite hose — three builds for acids, alkalis and solvents: a 10 bar plant hose, a 20 bar heavy duty grade for rail and ISO tank discharge, and a 14 bar dockside hose with a stainless bore. Bore 25 to 250 mm, -30 to +100 °C.
• PTFE composite hose — for the media that attack a polypropylene liner: concentrated oxidising acids, aromatic and chlorinated solvents. Bore 25 to 254 mm, 20 bar to 3 inch, -30 to +120 °C.
• Petroleum and biofuel composite hose — five builds across the fuel chain: suction and discharge, light oil, biofuel, bottom loading and fire retardant. 10 to 14 bar, bore 1 to 10 inch.
• Marine and terminal composite hose — five builds for the jetty and the ship: tanker, marine, dock, vapour recovery and nylon rope cover. Bore 50 to 250 mm, 14 to 15 bar, -40 to +180 °C.
• High temperature composite hose — for hot petroleum, hot solvents and heat transfer fluid to +177 °C. Bore 25 to 250 mm, 14 bar, 5:1 safety factor below 100 mm.
• Cryogenic composite hose — LNG at about -162 °C and liquid nitrogen at -196 °C in one build rated -200 to +80 °C. Bore 1 to 10 inch, 10 bar, 20 m maximum.

How a composite hose is built

Four layers do four different jobs, and every service failure can be traced to one of them. Knowing which layer is which is what turns a datasheet into a decision.

What the marking on the hose tells you

A correctly marked composite hose carries the bore, the working pressure, the standard it was built to, the quarter and year of manufacture, and the manufacturer. Read it before you re-order: the marking is the only record that survives when the paperwork is lost, and it is what a replacement is built against.

Two things are worth checking on delivery, on every hose. First, that the working pressure on the marking matches the purchase order, not the catalogue. Second, that the helix is continuous to both fittings, measured with a meter across the assembly; a reading at the fittings alone does not prove the helix is bonded through.

How to choose: three questions, in this order

Most wrong selections come from starting with the bore or the price. Start with the medium, because the liner decides whether the hose survives at all; then the duty, because that sets the pressure class; then the venue, because that sets length, cover and fittings.

Specification envelope across all 16 builds

This table is the fastest way to see whether a duty falls inside the range at all. If a requirement sits outside every row, the answer is a different hose type, not a different composite hose.

What the standards actually ask for

Composite hoses for hydrocarbons are built against EN 13765 or BS 5842. Both describe a hose of thermoplastic layers reinforced with fabric and helix wire, and both put the same four demands on a supplier. Ask for these four on any quotation, from any factory, including ours.

1. A proof test above working pressure. Usually 1.5 times working pressure held for a fixed period, with no leakage at the couplings.
2. A burst figure at or above four times working pressure. The 4:1 or 5:1 safety factor is the ratio between that burst result and the rated pressure, not a marketing margin.
3. Electrical continuity end to end. Measured on the finished assembly, with the helix bonded to both fittings. On fuel duty, continuity at the hose is necessary but not sufficient; the earthing of the vehicle or vessel is what dissipates the charge.
4. Adhesion between liner, fabric and cover. This is what fails first in service, and it is invisible from outside until the liner separates.

Boundary: we supply test data with each assembly and can provide type-test reports for the builds we produce. We do not describe a hose as approved by a standard body unless a certificate has actually been issued for it, and we will tell you which of the 16 builds that applies to.

Where a composite hose is the wrong choice

Composite construction earns its place on chemical and fuel transfer. On these duties it does not:

• Above 40 bar. Use a wire spiral hydraulic or industrial hose; the fabric carcass is not built for it.
• Saturated steam. Use a steam hose with a heat-resistant tube; a thermoplastic liner softens and the plies separate.
• Abrasive slurry and dry cement. Use a rubber slurry hose; the thin liner wears through at the bend.
• Full vacuum without a helix check. Standard builds handle vacuum to about 0.9 bar; deeper vacuum needs the heavy helix variant confirmed at order.
• Direct food and potable water contact. Use a hose with a food-contact declaration for the specific liner; a general purpose composite hose is not that.

Ordering, quantities and lead time

Custom lengths, non-standard flanges (EN 1092, ANSI B16.5, JIS, GOST) and tagged assemblies are built to order. Send the drawing and the medium, and the quotation states the liner, the helix material, the test pressure and the delivery date in writing.

Über HENGHUA

Hebei Henghua Rubber & Plastic Products Co., Ltd. has manufactured industrial hose since 2010 at a 18,000 m² plant with 12 automated production lines, and supplies 70 countries. Composite hose is built on the same lines as our rubber chemical and petroleum hose, which matters when a project needs both types to the same flange standard and the same delivery date.

Frequently asked questions

What is the difference between a composite hose and a rubber hose?

A composite hose uses thermoplastic film layers and a fabric carcass; a rubber hose uses a vulcanised rubber tube with textile or wire reinforcement. Composite hoses are lighter, tolerate a wider chemical range with a thinner wall, and can be built in long continuous lengths. Rubber wins on abrasion, on high pressure and on mechanical abuse.

How long does a composite hose last?

In chemical transfer, typically three to five years; in fuel terminal service, two to three years. The limit is usually the cover and the liner-to-fabric adhesion, not the helix. Hoses that are dragged, run over or stored in sunlight fail earlier than the same hose on a fixed loading arm.

Can a composite hose be repaired?

Couplings can be replaced and covers patched. A damaged liner cannot be repaired: once the liner is perforated the medium reaches the fabric and the hose is replaced. Any hose that has carried a hazardous medium should not be re-used on a different product.

Are all 16 builds certified to EN 13765?

Not all, and we would rather say so than imply otherwise. The builds we produce are designed and tested against the EN 13765 test set, and type-test reports are available for the builds where a third-party report exists. Tell us the build in your enquiry and we confirm in writing which reports apply to it.

What is the smallest quantity you supply?

100 m per size for bulk hose, one assembly for flanged jetty and loading arm hose. Sample lengths of 2 to 5 m can be supplied for trial before a bulk order.

Do you supply complete assemblies?

Yes. Assemblies are supplied with flanges, camlocks or tank couplings, with the helix bonded to both fittings, pressure tested and tagged. Send the flange standard, the face-to-face length and the medium.

Can you match an existing hose?

Yes, if you send the marking, the end fittings and the duty. Where the original manufacturer’s specification is not readable, the working pressure is confirmed from the application rather than guessed from the old hose.

Which build do I need for LPG?

LPG at ambient temperature is a pressure duty, not a cryogenic one: use the suction and discharge or tanker build with a conductive path. The cryogenic build is for liquefied gas at -162 °C and below, such as LNG and liquid nitrogen.

Not sure which of the 16 builds fits your duty? Send the medium, the concentration, the working temperature and the flow rate through the quotation form, and the liner and pressure class come back in writing.